US11176884B2 - OLED pixel driving circuit, array substrate and display device - Google Patents

OLED pixel driving circuit, array substrate and display device Download PDF

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Publication number
US11176884B2
US11176884B2 US16/755,585 US201716755585A US11176884B2 US 11176884 B2 US11176884 B2 US 11176884B2 US 201716755585 A US201716755585 A US 201716755585A US 11176884 B2 US11176884 B2 US 11176884B2
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switch
light emitting
emitting unit
drain
emitting diode
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US20200258447A1 (en
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Bobiao Chang
Xiaolong Chen
Yi-Chien Wen
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Shenzhen Chins Star Optoelectronics Semiconductor Display Technology Co Ltd
Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen Chins Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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    • G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
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    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
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Definitions

  • the present disclosure relates to the field of display technologies, and more particularly to an organic light emitting diode (OLED) pixel driving circuit, an array substrate, and a display device.
  • OLED organic light emitting diode
  • OLEDs Organic light emitting diodes
  • OLEDs have many excellent characteristics such as wide color gamut, high contrast, and solid-state devices, so they are becoming more and more competitive in the field of display technology.
  • a pixel array composed of electronic pixels is provided in a display area of an organic light emitting display, and each pixel unit includes a pixel driving circuit.
  • Traditional 2T1C architecture circuit means that the circuit includes two thin film transistors and a storage capacitor.
  • the thin film transistor that functions as a switch connects a data voltage to a gate of a driving thin film transistor when it is in the on state, and stores the data voltage on the storage capacitor. This keeps the driving thin film transistor on.
  • internal ions are polarized to form a built-in electric field. This causes a threshold voltage of the OLED to increase continuously, and luminous brightness of the OLED continues to decrease, and long-term light emission will shorten a life of the OLED and accelerate aging of the OLED.
  • the OLED can be placed in a reverse bias state in a display frame that does not emit light, and built-in electric field strength can be reduced.
  • each OLED device needs a corresponding data line. This doubles the data line routing in an OLED panel, resulting in a reduction in a panel aperture ratio.
  • each OLED corresponds to a driving thin film transistor and a storage capacitor, which doubles a number of storage capacitors in the panel, resulting in an increase in parasitic capacitance of the panel.
  • a technical problem mainly solved by the present invention is to provide an organic light emitting diode (OLED) pixel driving circuit, an array substrate, and a display device, which can reduce a number of parasitic capacitances and data lines in a panel and improve an aperture ratio of an OLED device.
  • OLED organic light emitting diode
  • a first technical solution adopted by the present invention is to provide an organic light emitting diode (OLED) pixel driving circuit, comprising: a driving control unit; a first light emitting unit; and a second light emitting unit;
  • OLED organic light emitting diode
  • the driving control unit comprises a first switch, a second switch, and a storage capacitor; a control end of the second switch is connected to a scan line, a drain of the second switch is connected to a data line, a source of the second switch is connected to an end of the storage capacitor and a control end of the first switch, and another end of the storage capacitor and a drain of the first switch are connected to a first power source;
  • a source of the first switch is connected to the first light emitting unit and the second light emitting unit, the first light emitting unit and the second light emitting unit are connected to a second power source, a control end of the first light emitting unit is connected to a first control signal, a control end of the second light emitting unit is connected to a second control signal, and the driving control unit, the first control signal, and the second control signal control the first light emitting unit and the second light emitting unit to alternately emit light.
  • a second technical solution adopted by the present invention is to provide an OLED display device, comprising: an OLED array substrate comprising a pixel driving circuit, wherein the pixel driving circuit comprises a driving control unit; a first light emitting unit; and a second light emitting unit;
  • the driving control unit comprises a first switch, a second switch, and a storage capacitor; a control end of the second switch is connected to a scan line, a drain of the second switch is connected to a data line, a source of the second switch is connected to an end of the storage capacitor and a control end of the first switch, and another end of the storage capacitor and a drain of the first switch are connected to a first power source;
  • a source of the first switch is connected to the first light emitting unit and the second light emitting unit, the first light emitting unit and the second light emitting unit are connected to a second power source, a control end of the first light emitting unit is connected to a first control signal, a control end of the second light emitting unit is connected to a second control signal, and the driving control unit, the first control signal, and the second control signal control the first light emitting unit and the second light emitting unit to alternately emit light.
  • a third technical solution adopted by the present invention is to provide an OLED display device, comprising: an OLED array substrate comprising a pixel driving circuit, wherein the pixel driving circuit comprises a driving control unit; a first light emitting unit; and a second light emitting unit;
  • the driving control unit comprises a first switch, a second switch, and a storage capacitor; a control end of the second switch is connected to a scan line, a drain of the second switch is connected to a data line, a source of the second switch is connected to an end of the storage capacitor and a control end of the first switch, and another end of the storage capacitor and a drain of the first switch are connected to a first power source;
  • a source of the first switch is connected to the first light emitting unit and the second light emitting unit, the first light emitting unit and the second light emitting unit are connected to a second power source, a control end of the first light emitting unit is connected to a first control signal, a control end of the second light emitting unit is connected to a second control signal, and the driving control unit, the first control signal, and the second control signal control the first light emitting unit and the second light emitting unit to alternately emit light.
  • Beneficial effects of the present invention are that: Different from the situation of the prior art, the present invention allows two OLEDs to share a driving thin film transistor, a storage capacitor, and a data line, so that the two OLEDs alternately emit light. In this way, the light emitting time of the OLEDs is reduced, the number of parasitic capacitors and data lines in a panel is reduced, and the aperture ratio of the OLED device is increased; and the OLEDs are enabled to be in reverse bias in a non-light emitting display frame, so that the OLEDs do not have to be in a DC bias state for a long time, and thus, the aging of the OLED device is slowed down. In addition, no other reverse bias voltage is connected externally, so the difficulty of tracing of the pixel circuit and the crosstalk from a bias voltage line to other signal lines are reduced.
  • FIG. 1 is a schematic diagram of a specific structure of an OLED pixel driving circuit according to an embodiment of the present invention.
  • FIG. 2 is a circuit timing diagram of an OLED pixel driving circuit according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an OLED array substrate according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a specific structure of an OLED pixel driving circuit according to an embodiment of the present invention.
  • the pixel driving circuit provided in this embodiment includes a driving control unit M 3 , a first light emitting unit M 1 , and a second light emitting unit M 2 .
  • the driving control unit M 3 includes a first switch T 1 , a second switch T 2 , and a storage capacitor Cst.
  • a control end of the second switch T 2 is connected to a scan line Vscan.
  • a drain of the second switch T 2 is connected to a data line Vdata.
  • a source of the second switch T 2 is connected to an end of the storage capacitor Cst and a control end of the first switch T 1 , respectively.
  • the first switch T 1 is a driving thin film transistor in this embodiment.
  • the second switch T 2 is used to transmit a data signal Vdata to its source under control of a scan signal Vscan.
  • the storage capacitor Cst is used to store a level between a source of the second switch T 2 and the first power source OVDD.
  • a source of the first switch T 1 is connected to the first light emitting unit M 1 and the second light emitting unit M 2 , respectively.
  • the first light emitting unit M 1 and the second light emitting unit M 2 are connected to a second power source OVSS, respectively.
  • a control end of the first light emitting unit M 1 is connected to a first control signal Ctr 1 .
  • a control end of the second light emitting unit is connected to a second control signal Ctr 2 .
  • the first light emitting unit M 1 in this embodiment specifically includes a third switch T 3 , a fifth switch T 5 , a seventh switch T 7 , a ninth switch T 9 , and a first light emitting diode OLED 1 .
  • An anode of the first light emitting diode OLED 1 is connected to a drain of the third switch T 3 and a drain of the seventh switch T 7 .
  • a cathode of the first light emitting diode OLED 1 is connected to a source of the ninth switch T 9 and a source of the fifth switch T 5 .
  • a drain of the fifth switch T 5 is connected to the first power source OVDD.
  • a source of the seventh switch T 7 and a drain of the ninth switch T 9 are connected to the second power source OVSS.
  • the second light emitting unit M 2 specifically includes a fourth switch T 4 , a sixth switch T 6 , an eighth switch T 8 , a tenth switch T 10 , and a second light emitting diode OLED 2 .
  • An anode of the second light emitting diode OLED 2 is connected to a drain of the fourth switch T 4 and a drain of the eighth switch T 8 .
  • a cathode of the second light emitting diode OLED 2 is connected to a source of the tenth switch T 10 and a source of the sixth switch T 6 .
  • a drain of the sixth switch T 6 is connected to the first power source OVDD.
  • a source of the eighth switch T 8 and a drain of the tenth switch T 10 are connected to the second power source OVSS.
  • the switches mentioned in the above embodiments include P-type and N-type transistor switches.
  • the first switch T 1 , the second switch T 2 , the fifth switch T 5 , the sixth switch T 6 , the seventh switch T 7 , and the eighth switch T 8 are N-type transistor switches.
  • the third switch T 3 , the fourth switch T 4 , the ninth switch T 9 , and the tenth switch T 10 are P-type transistor switches.
  • the P-type transistor switch is turned on when a control end thereof is low and turned off when the control end thereof is high.
  • the N-type transistor switch is turned off when a control end thereof is low and turned on when the control end thereof is high.
  • FIG. 2 is a circuit timing diagram of an OLED pixel driving circuit according to an embodiment of the present invention, which shows changes in levels of the scan signal Vscan, the first control signal Ctr 1 , and the second control signal Ctr 2 with time.
  • the level is relative.
  • the working process of the pixel driving circuit in this embodiment is divided into four phases: a first storage phase A, a first light-emitting display phase B, a second storage phase C, and a second light-emitting display phase D.
  • the first storage stage A and the first light-emitting display stage B constitute a first frame image.
  • the second storage stage C and the second light-emitting display stage D constitute a second frame image.
  • the first light emitting diode OLED 1 emits light
  • the second light emitting diode OLED 2 is reverse biased.
  • the second light emitting diode OLED 2 emits light
  • the first light emitting diode OLED 1 is reverse biased.
  • the driving control unit, the first control signal, and the second control signal in this embodiment collectively control the first light emitting unit and the second light emitting unit to alternately emit light.
  • a polarity of a level signal output by the first control signal Ctr 1 and a polarity of a level signal output by the second control signal Ctr 2 at the same time are opposite. That is, when the first control signal Ctr 1 is at a high level, the second control signal Ctr 2 is at a low level. When the first control signal Ctr 1 is at a low level, the second control signal Ctr 2 is at a high level.
  • the timing periods of the first control signal Ctr 1 and the second control signal Ctr 2 are the display times of two adjacent frames of images.
  • a voltage value of the first power source OVDD is higher than the voltage value of the second power source OVSS.
  • the voltage value of the first power source OVDD can be set to a positive voltage
  • the voltage value of the second power source OVSS can be set to a negative voltage
  • the voltage value of the first power source OVDD is set to be a positive voltage
  • the voltage value of the second power source OVSS is set to 0 V.
  • the scan signal Vscan and the second control signal Ctr 2 are at a high level, and the first control signal Ctr 1 is at a low level. Since the second switch T 2 is N-type, the second switch T 2 is turned on at this time, and the data signal Vdata is output to a node S 1 under control of the scan signal Vscan.
  • the storage capacitor Cst is in a charging state, and the first switch T 1 is in an off state.
  • the storage capacitor Cst is used to store a level between the node S 1 and the first power source OVDD. Since the third switch T 3 and the ninth switch T 9 are P-type, the third switch T 3 and the ninth switch T 9 are turned on.
  • the fifth switch T 5 and the seventh switch T 7 are N-type, so that the fifth switch T 5 and the seventh switch T 7 are turned off. At this time, the first light emitting diode OLED 1 cannot be driven to emit light because the first switch T 1 is turned off. Since the fourth switch T 4 and the tenth switch T 10 are P-type, the fourth switch T 4 and the tenth switch T 10 are turned off. Since the sixth switch T 6 and the eighth switch T 8 are N-type, the sixth switch T 6 and the eighth switch T 8 are turned on. At this time, the eighth switch T 8 transmits the level at a node S 4 to the anode of the second light emitting diode OLED 2 .
  • the sixth switch T 6 transmits the level at the node S 2 to the cathode of the second light emitting diode OLED 2 , so that the second light emitting diode OLED 2 is in a reverse bias state.
  • the storage of the level between the node S 1 and the first power source OVDD is mainly completed through the storage capacitor Cst. That is, the storage phase of the data signal Vdata of the first light emitting diode OLED 1 .
  • the scan signal Vscan and the first control signal Ctr 1 are at a low level, and the second control signal Ctr 2 is at a high level.
  • the second switch T 2 is turned off and the first switch T 1 is turned on.
  • the third switch T 3 and the ninth switch T 9 are P-type, the third switch T 3 and the ninth switch T 9 are turned on.
  • the fifth switch T 5 and the seventh switch T 7 are N-type, so that the fifth switch T 5 and the seventh switch T 7 are turned off.
  • the first power source OVDD, the first switch T 1 , the third switch T 3 , the first light emitting diode OLED 1 , the ninth switch T 9 , and the second power source OVSS form a path, and the first light emitting diode OLED 1 emits light. Since the fourth switch T 4 and the tenth switch T 10 are P-type, the fourth switch T 4 and the tenth switch T 10 are turned off. Since the sixth switch T 6 and the eighth switch T 8 are N-type, the sixth switch T 6 and the eighth switch T 8 are turned on. At this time, the second light emitting diode OLED 2 and the first storage stage A continue to be in a reverse biased state. That is, this stage is a light-emitting display stage of the first light emitting diode OLED 1 .
  • the scan signal Vscan and the first control signal Ctr 1 are at a high level, and the second control signal Ctr 2 is at a low level.
  • the second switch T 2 is N-type, the second switch T 2 is turned on at this time, and the data signal Vdata is output to the node S 1 under the control of the scan signal Vscan.
  • the storage capacitor Cst is in a charging state, the first switch T 1 is in an off state, and the storage capacitor Cst is used to store a level between the node S 1 and the first power source OVDD. Since the fourth switch T 4 and the tenth switch T 10 are P-type, the fourth switch T 4 and the tenth switch T 10 are turned on.
  • the sixth switch T 6 and the eighth switch T 8 are N-type, so that the sixth switch T 6 and the eighth switch T 8 are turned off. At this time, the second light emitting diode OLED 2 cannot be driven to emit light because the first switch T 1 is turned off. Since the third switch T 3 and the ninth switch T 9 are P-type, the third switch T 3 and the ninth switch T 9 are turned off. Since the fifth switch T 5 and the seventh switch T 7 are N-type, the fifth switch T 5 and the seventh switch T 7 are turned on. At this time, the seventh switch T 7 transmits the level at the node S 3 to the anode of the first light emitting diode OLED 1 .
  • the fifth switch T 5 transmits the level at the node S 2 to the cathode of the first light emitting diode OLED 1 , so that the first light emitting diode OLED 1 is in a reverse biased state.
  • the storage of the level between the node S 1 and the first power source OVDD is mainly completed by the storage capacitor Cst in this stage. That is, the storage phase of the data signal Vdata of the second light emitting diode OLED 2 .
  • the scan signal Vscan and the second control signal Ctr 2 are at a low level and the first control signal Ctr 1 is at a high level.
  • the second switch T 2 is turned off and the first switch T 1 is turned on.
  • the fourth switch T 4 and the tenth switch T 10 are P-type, the fourth switch T 4 and the tenth switch T 10 are turned on.
  • the sixth switch T 6 and the eighth switch T 8 are N-type, so that the sixth switch T 6 and the eighth switch T 8 are turned off.
  • the first power source OVDD, the first switch T 1 , the fourth switch T 4 , the second light emitting diode OLED 2 , the tenth switch T 10 , and the second power source OVSS form a path, and the second light emitting diode OLED 2 emits light. Since the third switch T 3 and the ninth switch T 9 are P-type, the third switch T 3 and the ninth switch T 9 are turned off. Since the fifth switch T 5 and the seventh switch T 7 are N-type, the fifth switch T 5 and the seventh switch T 7 are turned on. At this time, the first light emitting diode OLED 1 continues to be in a reverse-biased state like the second storage stage C. That is, this stage is a light-emitting display stage of the second light emitting diode OLED 2 .
  • an embodiment of the present invention makes two OLEDs alternately emit light by sharing a driving thin film transistor, a storage capacitor, and a data line with the two OLEDs.
  • the light emitting time of the OLEDs is reduced, the number of parasitic capacitors and data lines in a panel is reduced, and the aperture ratio of the OLED device is increased; and the OLEDs are enabled to be in reverse bias in a non-light emitting display frame, so that the OLEDs do not have to be in a DC bias state for a long time, and thus, the aging of the OLED device is slowed down.
  • no other reverse bias voltage is connected externally, so the difficulty of tracing of the pixel circuit and the crosstalk from a bias voltage line to other signal lines are reduced.
  • FIG. 3 is a schematic structural diagram of an OLED array substrate according to an embodiment of the present invention.
  • the array substrate 300 includes a plurality of OLED pixel units 301 arranged in an array.
  • Each OLED pixel unit 301 includes a pixel driving circuit as described above.
  • An embodiment of the present invention also provides an OLED display device.
  • the display device is provided with the OLED array substrate.
  • the array substrate includes a plurality of OLED pixel units arranged in an array.
  • Each OLED pixel unit includes a pixel driving circuit as described above.
  • the OLED display device may specifically be a product with a display function such as a mobile phone, a tablet computer, a television, a display, a digital camera, and the like.
  • the present invention allows two OLEDs to share a driving thin film transistor, a storage capacitor, and a data line, so that the two OLEDs alternately emit light.
  • the light emitting time of the OLEDs is reduced, the number of parasitic capacitors and data lines in a panel is reduced, and the aperture ratio of the OLED device is increased; and the OLEDs are enabled to be in reverse bias in a non-light emitting display frame, so that the OLEDs do not have to be in a DC bias state for a long time, and thus, the aging of the OLED device is slowed down.
  • no other reverse bias voltage is connected externally, so the difficulty of tracing of the pixel circuit and the crosstalk from a bias voltage line to other signal lines are reduced.

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EP3709365A1 (en) 2020-09-16
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EP3709365A4 (en) 2021-08-25
JP2020535476A (ja) 2020-12-03

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